3″ – 300LB – RF Piston Type Pneumatic Actuated Control Valve with E/P Positioner
Technical Data Sheet
- General Information
Item | Description |
Valve Type | Pneumatic Actuated Control Valve / Globe Control Valve |
Nominal Size | 3 Inch (DN80) |
Pressure Rating | Class 300 LB (PN50) |
Body Material | Carbon Steel WCB / Stainless Steel CF8M (as required) |
Flange Connection | RF (Raised Face) to ASME B16.5 Class 300 |
Actuator Type | Piston Type Pneumatic Actuator (single-acting or double-acting) |
Accessories | Electro-Pneumatic (E/P) Positioner, 4-20mA input signal |
Application | Precise flow, pressure, or temperature control in oil, gas, chemical, power, and metallurgical industries |
- Design & Manufacturing Standards
Standard | Description |
Valve Design Code | ANSI/ISA-75.08.01 / ASME B16.34 / IEC 60534 series |
Face-to-Face Dimension | ANSI/ISA-75.08.01 / ASME B16.10 |
Flange Dimensions | ASME B16.5 Class 300 RF |
Pressure-Temperature Rating | ASME B16.34 |
Leakage Class | FCI 70-2 / IEC 60534-4 (Class IV standard; Class V/VI optional) |
Inspection & Testing | IEC 60534-4 / ANSI/ISA-75.08.01 |
Actuator Standard | IEC 60534-6 / ISO 5210 (mounting interface) |
Positioner Standard | IEC 60534-6-1 (mounting and signal interface) |
Fire Safe Design | API 607 / ISO 10497 (optional) |
- Main Materials (Typical – can be customized)
3.1 Valve Body Assembly
Component | Standard Material (Carbon Steel) | Optional Material (SS / Alloy) |
Body | ASTM A216 WCB Cast Steel | ASTM A351 CF8M (316 SS), Alloy Steel |
Bonnet | ASTM A216 WCB (matching body) | ASTM A351 CF8M |
Valve Plug (Trim) | ASTM A479 304/316 SS + Stellite hardfacing | 316L, Hastelloy, Monel |
Seat | ASTM A479 304/316 SS + Stellite hardfacing | 316L, Hastelloy, PEEK |
Stem | ASTM A276 304/316 SS | 17-4PH, Inconel |
Stem Packing | Flexible graphite + SS spacer rings | PTFE, low emission packing (ISO 15848) |
Gaskets | Flexible graphite + SS spiral wound | Metal ring gasket, PTFE |
Fasteners | ASTM A193 B7 Alloy Steel (zinc plated) | ASTM A193 B8 Stainless Steel |
3.2 Actuator Assembly
Component | Standard Material | Optional Materials |
Cylinder Body | Cast aluminum / Carbon steel | Stainless steel |
Piston | Carbon steel + chrome plating / Stainless steel | Bronze |
Piston Seal | NBR / PTFE + carbon graphite | FKM, Silicone |
Cylinder End Cap | Cast aluminum / Carbon steel | Stainless steel |
Spring (single-acting) | Alloy spring steel | Stainless steel |
Air Supply Port | G 1/4″ / NPT 1/4″ | Custom |
3.3 Positioner Assembly
Component | Standard Material / Specification | Optional Specifications |
Positioner Housing | Cast aluminum / Engineering plastic | Stainless steel (corrosion resistant) |
Input Signal | 4-20 mA DC (two-wire) | 0-10V, HART, Profibus PA |
Air Supply Port | G 1/4″ / NPT 1/4″ | — |
Enclosure Protection | IP66 (standard) | IP67, Explosion-proof Ex d / Ex ia |
- Outline Dimensions & Weight (Typical values – may vary by manufacturer)
Dimension Parameter | Value (Typical) |
Face-to-Face Length L | Approx. 295 mm (per ANSI/ISA-75.08.01) |
Flange Outer Diameter D | Approx. 210 mm (ASME B16.5 Class 300) |
Bolt Circle Diameter K | Approx. 168 mm |
Flange Thickness C | Approx. 28 mm |
Number / Diameter of Bolt Holes | 8 × 22 mm |
Center Height (flange face to center) | Approx. 150 mm |
Overall Height (incl. actuator & positioner) H | Approx. 800 – 1,100 mm (depending on actuator size and stroke) |
Valve Body Weight (excl. actuator) | Approx. 55 – 70 kg (depending on material) |
Actuator Weight (reference) | Approx. 40 – 100 kg (depending on bore and stroke) |
Dimensions and weights above are typical references. Final dimensions to be confirmed with manufacturer’s drawing.
- Pressure-Temperature Rating (ASME B16.34 – WCB body, Material Group 1.1)
Temperature (°C) | Max. Working Pressure (bar) | Max. Working Pressure (psig) |
-29 ~ 38 | 51.1 | 740 |
100 | 46.6 | 675 |
150 | 44.8 | 650 |
200 | 41.9 | 610 |
250 | 39.5 | 575 |
300 | 37.1 | 540 |
350 | 34.1 | 495 |
400 | 30.2 | 440 |
425 | 26.8 | 390 |
Data based on ASME B16.34 Material Group 1.1. For stainless steel bodies (Group 2.1), pressure-temperature ratings differ. Maximum allowable working pressure decreases with increasing temperature.
- Performance Data
6.1 Valve Body
Parameter | Value |
Pressure Rating | Class 300 (51.1 bar @ 38°C) |
Shell Test Pressure | 1.5 × rated pressure (approx. 77 bar) |
Seat Test Pressure | 1.1 × rated pressure (approx. 56 bar) |
Low-Pressure Air Seat Test | 6 bar |
Leakage Class (standard) | Class IV (FCI 70-2 / IEC 60534-4) |
Leakage Class (optional) | Class V / Class VI (soft seat) |
Flow Characteristic | Equal Percentage (EQ%) / Linear (LIN) |
Flow Coefficient Cv (typical) | Approx. 100 – 150 (depending on trim and stroke) |
Rangeability | 50:1 (standard) |
Temperature Range (standard graphite packing) | -29°C ~ +425°C |
Temperature Range (low temp service) | -196°C ~ +260°C (with low temp materials) |
Suitable Media | Water, steam, oil, gas, chemical media, etc. |
6.2 Piston Actuator
Parameter | Value |
Action Type | Single-acting (spring return) / Double-acting (no spring) |
Air Supply Pressure | 4 – 8 bar (6 bar recommended) |
Stroke | 25 mm, 38 mm, 50 mm, etc. (sized based on valve size and differential pressure) |
Output Thrust (single-acting) | Depends on cylinder area and supply pressure; up to 5,000 – 50,000 N |
Output Thrust (double-acting) | Depends on cylinder area and supply pressure; up to 10,000 – 100,000 N |
Travel Speed | ≤ 1.5 sec / full stroke (adjustable) |
Explosion Proof | No electrical parts; not intrinsically explosion-proof; can be fitted with Ex accessories |
Enclosure Protection | IP65 / IP67 |
Ambient Temperature Range | -20°C ~ +80°C (standard seals) |
6.3 E/P Positioner
Parameter | Value |
Input Signal | 4-20 mA DC (two-wire, loop powered) |
Input Impedance | Approx. 250 Ω (4-20mA) |
Output Pneumatic Signal | 0.2 – 1.0 bar (standard) / 0 – 10 bar (optional) |
Supply Pressure | 1.4 – 7 bar (depending on actuator requirement) |
Air Consumption | Single-acting: approx. 5 L/min (at 0.14 MPa supply)
Double-acting: approx. 15 L/min (at 0.4 MPa supply) |
Linearity | ≤ ±1.0% F.S. |
Repeatability | ≤ ±0.5% F.S. |
Sensitivity | ≤ 0.2% F.S. |
Stroke Range | 10 – 100 mm (linear valve) |
Ambient Temperature Range | -20°C ~ +70°C |
Enclosure Protection | IP66 (standard) |
Explosion Proof (optional) | Ex d IIC T4 / Ex ia IIC T4 |
Communication Protocol (optional) | HART, Profibus PA, Foundation Fieldbus |
Valve Position Feedback (optional) | 4-20 mA position feedback signal |
- Key Features
- Piston actuator – High output thrust, fast response; suitable for high differential pressure applications. Single-acting version with spring return provides fail-safe action (valve moves to preset safe position upon air supply loss).
- High accuracy E/P positioner – Converts 4-20mA signal to pneumatic output for precise valve positioning; excellent linearity and repeatability.
- Globe valve trim design – Equal percentage or linear flow characteristics available to meet various control requirements.
- Hard-faced metal seat – Standard Class IV leakage; optional Class V/VI for tighter shut-off.
- Blow-out proof stem – Ensures safety under high pressure.
- Low emission packing (optional) – Meets ISO 15848 fugitive emission standards for environmentally sensitive applications.
- High temperature and corrosion resistance – Suitable materials and packing extend service to high temperature, cryogenic, and corrosive media.
- Modular accessories – Can be equipped with position feedback, limit switches, solenoid valves, filter regulators, etc., for full automation.
- Fail-Safe Configuration (Single-Acting Actuator)
Action Type | Valve Position on Air Supply Loss | Valve Position on Signal Loss |
Air-to-Open (ATO / FC) | Spring return → Fail Closed | Positioner output goes to zero → Valve closes |
Air-to-Close (ATC / FO) | Spring return → Fail Open | Positioner output goes to zero → Valve opens |
Double-acting | No spring → Fail Lock (holds last position) | Depends on positioner configuration |
Note: Valve position on signal loss depends on the positioner configuration (single-acting positioners typically output zero signal, causing the valve to return to the spring-set position).
- Optional Accessories
Accessory | Description |
Air Filter Regulator | Cleans and stabilizes air supply pressure |
Solenoid Valve | Provides emergency shut-off or remote on-off control |
Position Transmitter / Limit Switches | Provides 4-20mA position feedback or dry contact signals |
Lock-up Valve | Maintains valve position upon air supply failure |
Pneumatic Booster | Increases response speed for high flow applications |
Manual Override (Handwheel) | Allows manual operation when power/air is lost |
- Ordering Information
Please provide the following when ordering:
- Valve specifications – Size (3″), pressure rating (Class 300), connection (RF)
- Body material – WCB / CF8M / other alloy
- Trim material & hardness – Plug and seat material (Stellite hardfacing, etc.)
- Flow characteristic – Equal percentage / Linear
- Leakage class – Class IV / V / VI
- Actuator – Single-acting (ATO/ATC) or double-acting; supply air pressure
- Positioner specifications – Input signal (4-20mA), explosion-proof rating, communication protocol, enclosure protection
- Accessories required – Filter regulator, solenoid valve, limit switches, handwheel, etc.
- Process conditions – Media name, temperature, pressure, differential pressure, flow range
- Special requirements – NACE MR0175 for sour service, low emission packing (ISO 15848), third-party inspection (BV, DNV, TÜV, etc.)
GUATANTEE:
SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.
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